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does it matter where the mufflers go under the truck, Is it going to make any difference in sound or performance,, if the mufflers are up by the cab close to the headers versis back under the bed by the axle...
Aside from the factory heat shielding being in a particular spot, it really doesn't matter. You may find the sound or heat could be an issue to you later.
I don't think it would really matter on performance.